arrow/testing/executor_util.h

0001 // Licensed to the Apache Software Foundation (ASF) under one
0002 // or more contributor license agreements.  See the NOTICE file
0003 // distributed with this work for additional information
0004 // regarding copyright ownership.  The ASF licenses this file
0005 // to you under the Apache License, Version 2.0 (the
0006 // "License"); you may not use this file except in compliance
0007 // with the License.  You may obtain a copy of the License at
0008 //
0009 //   http://www.apache.org/licenses/LICENSE-2.0
0010 //
0011 // Unless required by applicable law or agreed to in writing,
0012 // software distributed under the License is distributed on an
0013 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
0014 // KIND, either express or implied.  See the License for the
0015 // specific language governing permissions and limitations
0016 // under the License.
0017
0018 #pragma once
0019
0020 #include "arrow/util/thread_pool.h"
0021
0022 namespace arrow {
0023
0024 /// An executor which synchronously runs the task as part of the SpawnReal call.
0025 class MockExecutor : public internal::Executor {
0026  public:
0027   int GetCapacity() override { return 0; }
0028
0029   Status SpawnReal(internal::TaskHints hints, internal::FnOnce<void()> task, StopToken,
0030                    StopCallback&&) override {
0031     spawn_count++;
0032     std::move(task)();
0033     return Status::OK();
0034   }
0035
0036   int spawn_count = 0;
0037 };
0038
0039 /// An executor which does not actually run the task.  Can be used to simulate situations
0040 /// where the executor schedules a task in a long queue and doesn't get around to running
0041 /// it for a while
0042 class DelayedExecutor : public internal::Executor {
0043  public:
0044   int GetCapacity() override { return 0; }
0045
0046   Status SpawnReal(internal::TaskHints hints, internal::FnOnce<void()> task, StopToken,
0047                    StopCallback&&) override {
0048     captured_tasks.push_back(std::move(task));
0049     return Status::OK();
0050   }
0051
0052   std::vector<internal::FnOnce<void()>> captured_tasks;
0053 };
0054
0055 }  // namespace arrow